|
bmiColors member of BITMAPINFO is variable sized array. Its size can be zero or more depending on other attributes such as biClrUsed, biBitCount and last parameter of GetDIBits() which can be DIB_PAL_COLORS or DIB_RGB_COLORS.
BITMAPINFOHEADER[^]
Excerpt from above link.
If biCompression equals BI_RGB and the bitmap uses 8 bpp or less, the bitmap has a color table immediatelly following the BITMAPINFOHEADER structure. The color table consists of an array of RGBQUAD values. The size of the array is given by the biClrUsed member. If biClrUsed is zero, the array contains the maximum number of colors for the given bitdepth; that is, 2^biBitCount colors.
In our case, 2 ^ 8 = 256 color table entries exist.
You may also want to look at BITMAPINFO[^].
If bmpInfo.bmiHeader.biBitCount = 0x01; then it is a monochrome bitmap and color table will have two entries (e.g. RGB(0, 0, 0) and RGB(255, 255, 255)).
Color table is array of colors used in the bitmap.
|
|
|
|
|
for example, if all the necessary interfaces for a windowless control is implemented as below,
how to create the control on a dialog, and let it working properly?
class my_ctl : public IOleInPlaceObjectWindowless, public IOleInPlaceSiteWindowless, public IViewObjectEx
{
...
}
Thanks in advance.
BTW, I want it be as simple as possible, just let it work.
|
|
|
|
|
Hi,
I need to draw letters. I have the letter contour points. For normal letter it is easy. But for the letter such as: A, B, D, O, ..
I am using "CreatePolygonRgn" function to draw the letter which has color filled. But I got lines connecting two different contour within one letter.
For example, letter "O", If I fill a color with outside circle and fill none color within inside circle, the background will covered.
Do you have idea how to correctly draw the letter?
Best,
|
|
|
|
|
You need to use transparency (aka Alpha blending) in your colours to allow the background to be seen through.
I must get a clever new signature for 2011.
|
|
|
|
|
Hard to say because your description of the problem is a bit vague, but if i guess right, you could try using CombineRgn[^] ( or CRgn::CombineRgn[^] ) to subtract the holes from your regions.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> //TODO: Implement signature here<
|
|
|
|
|
Depending on the polygon fill mode, the direction of the polygon outline, clockwise/anti-clockwise, is important as to how GDI handles it, i.e. hole or filled region. You might want to check that out. SetPolyFillMode[^]
|
|
|
|
|
I have a GUI Activex Application . Now I want to get the key press event when focus is on any one of the window control ,i.e.text box , button , listcontrol slider control etc.
Rajesh
|
|
|
|
|
There are lots of ways to solve this...
You could create events for all your controls.
-- In the resource editor right click each control and select add "event handler".
-- then in your code the event handler will appear and you'll be able to control what you want to do with it.
If you need to do that for a lot of controls and the behavior should be the same extend a control class and pre-program it.
You could also capture the WM_KEYDOWN message.
-- Open the class assistant (CTRL+shift+X).
-- messages tab.
-- add the WM_KEYDOWN handler.
You are done.
Hope this helps.
|
|
|
|
|
I use MFC to build a win32 Dynimic-link library. Then I get a bb.dll.I use SetDll.exe to add bb.dll to gogosai.exe.When I
choose A simple DLL project to build the dll,It does not work.When I choose A dll is exports some symbols project to build,It works.
Why???
|
|
|
|
|
Hi,
From your posting it is not clear what you want to achieve. Please be specific and state clearly your actual problem.
Nitheesh George
http://www.simpletools.co.in
|
|
|
|
|
Hi,
After reading your posting 3 times, i think that you wanted to a dll reference to another project, right?. If so, when you create a dll project with some export functions the IDE adds the exporting function as like
extern "C" __declspec(dllexport) void myFunc()
{
}
This tells the C++ complier not to use name mangling. So you can use LoadLbrary to get a pointer to this function in this dll like
HMODULE hMod = LoadLibrary("MyDlLL.dll");
GetProcAddress(hMod, "MyFunc");
this works well you specify extern "C"(Please see MSDN to know more about this).
For a dll that doesn't exports any functions/class don't allow accessing the its functions or classes.
If you don't wish to use the loadLibrary u can do the following steps to add a reference to a dll.
1. Mark the class as exported (__declspec(dllexport) class classA)
1. add the header file of the dll you want to refer.
2. Add the lib file of the dll to the linker options(Additional dependencies) of your project.
3. Make sure that you specify the path to lib correctly.
3. compile.
Hopes this helps.
Nitheesh George
http://www.simpletools.co.in
|
|
|
|
|
|
i'm surprised you read it that many times! ...i give up on the first try...if i can't read it, i won't try to answer it...lol
...you're a lot kinder... 
|
|
|
|
|
Thank you Albert 
Nitheesh George
http://www.simpletools.co.in
|
|
|
|
|
you get my 5 just for trying that hard to help someone!
|
|
|
|
|
How can I change background / text color of an CComboBox , but that have CBS_DROPDOWNLIST style ?
Thank you .
|
|
|
|
|
You need to handle OnCtlColor()[^] in your parent window to check (nCtlColor == CTLCOLOR_EDIT) condition for normal state.
You need to subclass CComboBox and handle OnCtlColor() to check (nCtlColor == CTLCOLOR_LISTBOX) condition for dropped down state, that is, while the list box is visible. In this case a child LB is created on the fly.
In OnCtlColor() members:
pDC->SetTextColor(clrTextColor));
pDC->SetBkColor(clrBkColor);
if(NULL == m_pBrush)
m_pBrush = new CBrush(clrBkColor);
return (HBRUSH)*m_pBrush;
Don't forget to return HBRUSHes in both cases.
|
|
|
|
|
posted your solution as a question... this isn't jeopardy! 
...i was about to give you a 5 when i noticed all i could choose was "good question/bad question"...
|
|
|
|
|
|
Something I didn't do well , because at me is still white bkg/text color ...
|
|
|
|
|
Hi, which background you are talking about whether drop down list or in combo box itself.
|
|
|
|
|
I mean drop down list , not edit box where I succeded :
HBRUSH CComboBoxExt::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
if(nCtlColor == CTLCOLOR_EDIT)
{
if(! m_bAlertText)pDC->SetTextColor(COLOR_BLACK);
else pDC->SetTextColor(COLOR_RED);
if(! m_bAlertBkg)pDC->SetBkColor(COLOR_WHITE);
else pDC->SetBkColor(COLOR_ALERT);
}
pDC->SetBkMode(TRANSPARENT);
if(m_bAlertBkg)return m_hBrushAlert;
return m_hBrushWhite;
}
well , I change CTLCOLOR_EDIT with CTLCOLOR_LISTBOX but with no effect ... I don't know why ...
|
|
|
|
|
In above code, that is, subclassed combo box's OnCtlColor() member, you should handle CTLCOLOR_LISTBOX for dropped-down list box.
May be, subclassing fails.
To ensure that above code is called, put the following line on top of function.
TRACE(_T("CComboBoxExt::OnCtlColor() was called with nCtlColor: %d\n"), nCtlColor);
And watch output window to see above phrase.
|
|
|
|
|
I think I am in dead point ... I use already OnCtlColorListBox but for other reason , and with other signature :
ON_MESSAGE(WM_CTLCOLORLISTBOX, OnCtlColorListBox)
...
...
LRESULT CComboBoxExt::OnCtlColorListBox(WPARAM wParam, LPARAM lParam)
{
if(m_hListBox == NULL)
{
HWND hWnd = reinterpret_cast<HWND>(lParam);
if(hWnd != 0 && hWnd != m_hWnd)
{
m_hListBox = hWnd;
m_pWndProc = reinterpret_cast<WNDPROC>(GetWindowLong(m_hListBox, GWL_WNDPROC));
SetWindowLong(m_hListBox, GWL_WNDPROC, reinterpret_cast<long>(ComboBoxListBoxProc));
}
}
return 1;
}
to get a handle to list box window ...
|
|
|
|
|
Yes. This blocks OnCtlColor(CTLCOLOR_LISTBOX). OnCtlColor() (WM_CTLCOLOR) is retained from 16Bit Windows and should be managed by MFC using newer messages like WM_CTLCOLORLISTBOX.
You can also use this handler to do your work, the HDC is wParam and you need to return a valid HBRUSH.
But, above return value is invalid (as brush). Probably, that listbox should paint itself if this doesn't produce a problem. In this case, how could you paint again?
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
